The incremental validity of two metrics of the visual-motor function were tested against a metric of the non-verbal intellectual ability. This aspect has not been tested frequently in research about these constructs. The Modified Bender Gestalt Test (BGT-M) was used against the fourth generation of the Visual-Motor Integration Test (VMI-4) and the DAP:IQ test in 154, 4-8 year old students of two public schools. We used multiple hierarchical regression in the visual-motor metric over the intellectual ability test scores, controlling for age. Results show that, compared with VMI-4, the visual-motor metric with the BGT-M contains more specific variance, beyond that explained by age, while variance in the visual-motor metric was explained by both metrics alike. The implications of these results for psychological evaluations are discussed.

The incremental validity of two metrics of the visual-motor function were tested against a metric of the non-verbal intellectual ability. This aspect has not been tested frequently in research about these constructs. The Modified Bender Gestalt Test (BGT-M) was used against the fourth generation of the Visual-Motor Integration Test (VMI-4) and the DAP:IQ test in 154, 4-8 year old students of two public schools. We used multiple hierarchical regression in the visual-motor metric over the intellectual ability test scores, controlling for age. Results show that, compared with VMI-4, the visual-motor metric with the BGT-M contains more specific variance, beyond that explained by age, while variance in the visual-motor metric was explained by both metrics alike. The implications of these results for psychological evaluations are discussed.